33results about How to "Make up for the lack of precision" patented technology

Embodiments of the invention provide a user portrait generation method and apparatus. The method comprises the steps of obtaining online shopping behavior information of a target account; obtaining vehicle information of a vehicle associated with the target account, wherein the vehicle information includes vehicle-based operation behavior information of a user, driving state information of the vehicle and equipment information of the vehicle, and the equipment information is used for describing equipment states of all equipment on the vehicle; and based on the online shopping behavior information and the vehicle information, generating a user portrait corresponding to the target account. By combining the online shopping behavior information with the vehicle information of the vehicle, theuser portrait is generated, so that the defect of low precision of the user portrait generated only according to the online shopping behavior is effectively made up for, and the user portrait is moreaccurate and more targeted.

The invention relates to a method for manufacturing a solar cell. The method comprises the following steps of: etching a longitudinal main grating groove and a transverse grating groove on the front surface of a silicon chip by laser, making the surface reacted by adding dilute solution of NaOH to form a pile surface, washing the pile surface by adding dilute solution of HCl and dilute solution of HF in sequence, filling gaseous POCl3 at a temperature of between 850 and 920 DEG C, and performing high-temperature dispersion to form a PN junction on the front surface of the cell; filling SiH4 gas and NH3 gas, forming a surface antireflecting film by the chemical vapor deposition, pre-fabricating a nickel alloy mask plate which is provided with grating-shaped holes corresponding to grating-shaped electrode grooves of the silicon chip, making the grating-shaped holes of the mask plate and the grating-shaped electrode grooves justify, and by using printing equipment, pressing silver paste on the front surface in the grating-shaped electrode grooves on the surface of the silicon chip through the grating-shaped holes in a printing mode; and printing an aluminum layer and the silver paste on the back surface, and in a sintering furnace, sintering the aluminum layer and the silver paste at a temperature of between 850 and 950 DEG C by infrared rays to form electrodes. For the solar cell manufactured by the method, the metal is fully contacted wit the silicon chip, and the photoelectric conversion efficiency is high.

Embodiments of the invention provide a user portrait generation method and apparatus. The method comprises the steps of obtaining online shopping behavior information of a target account; obtaining vehicle information of a vehicle associated with the target account, wherein the vehicle information includes vehicle-based operation behavior information of a user, driving state information of the vehicle and equipment information of the vehicle, and the equipment information is used for describing equipment states of all equipment on the vehicle; and based on the online shopping behavior information and the vehicle information, generating a user portrait corresponding to the target account. By combining the online shopping behavior information with the vehicle information of the vehicle, theuser portrait is generated, so that the defect of low precision of the user portrait generated only according to the online shopping behavior is effectively made up for, and the user portrait is moreaccurate and more targeted.

The invention discloses an optimized sampling method for an acquisition device of a secondary loop of a power system. A current signal of a measuring loop and a current signal of a protecting loop are synchronously introduced through a data acquisition unit; an acquired data reduction and judgment system in the acquisition unit performs analysis and selection so as to select corresponding sampling loop signals as input data of a monitoring device. The method, as a measuring plan with low cost and high precision, is capable of completely combining output results of two mutual inductors in a mode of software switching, which eliminates interferences brought by traditional hardware circuit switching, makes up for precision shortages when existing acquisition devices sample low magnitude of current, and effectively improves the measuring precision within a full range. Furthermore, the method can be widely applicable to various devices such as a line oscillograph, a main variation oscillograph, a set oscillograph, a PMU, a power quality and transmission line parameter synchronously measuring device, and to analog quantity sampling when the two or more device functions synchronously exist in a device with multiple functions.

The invention discloses a device and a method for collecting space two-dimensional spectrum data, which mainly solve the defect that the prior unit detector type Fourier infrared spectrum radiometer and the infrared imaging spectrum radiometer are inconvenient to use or have low spectrum resolution when collecting two-dimensional space spectrum distribution data. The prior unit detector type Fourier infra-red spectrum radiometer is additionally provided with a two-dimensional scanning mechanism with automatic adjustment, and the collection of two-dimensional spectrum data is completed by controlling the rotation of a plane reflector arranged on a two-axis electric-control automatic revolving table in the two-dimensional scanning mechanism. A synchronous controller is connected with a spectrum radiometer and the two-dimensional scanning mechanism to synchronously control the scanning of the two-dimension scanning mechanism and the spectrum data collection, and finally a data cube comprising one-dimensional spectrum information of high spectrum resolution and plentiful two-dimensional space information is formed. The invention enhances the collection efficiency and the space collection precision of spectrum radiation data and can be used for infrared target spectrum imaging and target spectrum analysis.